Looks like they are doing this to prevent the SEO community from giving their updates wrong / unfavorable names. https://www.seroundtable.com/google-to-pre-announce-future-core-updates-27716.html? Two reliable sources to look for future update announcements: https://twitter.com/searchliaison https://twitter.com/dannysullivan Will they be also announcing WHAT their updates will be about? Not sure. Stay tuned!